export class RequestHeader{
  constructor() {
    this.header = {}
  }
   setHeader = function(key, value) {
    this.header[key] = value;
  };
   getHeaderByKey = function(key) {
    return this.header[key];
  };
   getHeader = function() {
    return this.header;
  };
   deleteHeader = function(key) {
    if (this.header.hasOwnProperty(key)) Reflect.deleteProperty(this.header, key);
  };
}
